[PATCH] hw/pci-host/grackle: Verify PIC link is properly set

[Philippe Mathieu-Daudé]

The Grackle PCI host model expects the interrupt controller
being set, but does not verify it is present. Add a check to
help developers using this model.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/pci-host/grackle.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/pci-host/grackle.c b/hw/pci-host/grackle.c
index 57c29b20afb..20361d215ca 100644
--- a/hw/pci-host/grackle.c
+++ b/hw/pci-host/grackle.c
@@ -76,6 +76,10 @@ static void grackle_realize(DeviceState *dev, Error **errp)
     GrackleState *s = GRACKLE_PCI_HOST_BRIDGE(dev);
     PCIHostState *phb = PCI_HOST_BRIDGE(dev);
 
+    if (!s->pic) {
+        error_setg(errp, TYPE_GRACKLE_PCI_HOST_BRIDGE ": 'pic' link not set");
+        return;
+    }
     phb->bus = pci_register_root_bus(dev, NULL,
                                      pci_grackle_set_irq,
                                      pci_grackle_map_irq,
-- 
2.26.2